You mean 20W/50
Well which year make is your car
I dont think that Maruti Suzuki recommend 20W/50 Engine Oil in any of its car range
They were recommending 20W/40 earlier in Alto, which was changed to 5W/30 since 2011 / 2012 and now shifted to 0W/20 Grade Oil

Suggest to check out Owner Manual, you seem to have put in incorrect grade oil - best to drain and replace in as per owner manual